21260115 has 24 divisors (see below), whose sum is σ = 39019968. Its totient is φ = 10671360.

The previous prime is 21260101. The next prime is 21260117. The reversal of 21260115 is 51106212.

It is not a de Polignac number, because 21260115 - 2⁶ = 21260051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13131 + ... + 14660.

It is an arithmetic number, because the mean of its divisors is an integer number (1625832).

Almost surely, 2^21260115 is an apocalyptic number.

21260115 is a deficient number, since it is larger than the sum of its proper divisors (17759853).

21260115 is a wasteful number, since it uses less digits than its factorization.

21260115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27819 (or 27816 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21260115 is about 4610.8692239100. The cubic root of 21260115 is about 277.0268538220.

Adding to 21260115 its reverse (51106212), we get a palindrome (72366327).

The spelling of 21260115 in words is "twenty-one million, two hundred sixty thousand, one hundred fifteen".